Dimitar Berbatov added a fourth after more good work from Valencia, while the Ecuador international capped a fine individual performance when chipping home the fifth goal.

Meanwhile, at Fratton Park, Portsmouth's troubles deepened following a heay defeat at the hands of in-form Arsenal.

The club had earlier issued a statement denying being formally served with a winding up petition by Her Majesty's Revenue and Customs in respect of disputed tax payments -- and their mood was not helped after a thrashing that left them still bottom of the table by four points.

The visitors were always in command after Eduardo's free-kick had deflected in off Younes Kaboul to give them an early lead.

Samir Nasri drilled in a second just before half-time, after a well-worked move, while teenager Aaron Ramsey smashed home a third on 69 minutes after some fine individual skill.

Although Nadir Belhadj pulled a goal back for the home side, midfielder Alex Song nodded in a fourth with 10 minutes left from Nasri's right-wing cross.